public class TransformFeatureSource extends Object implements SimpleFeatureSource
| Modifier and Type | Field and Description |
|---|---|
protected static FilterFactory2 |
FF |
protected static Logger |
LOGGER |
protected SimpleFeatureSource |
source |
protected Transformer |
transformer |
| Constructor and Description |
|---|
TransformFeatureSource(SimpleFeatureSource source,
Name name,
List<Definition> definitions)
Creates a transformed feature source from the original source, giving it a certain name and a
set of computed properties
|
| Modifier and Type | Method and Description |
|---|---|
void |
addFeatureListener(FeatureListener listener)
Registers a listening object that will be notified of changes to this
FeatureSource. |
ReferencedEnvelope |
getBounds()
Get the spatial bounds of the feature data.
|
ReferencedEnvelope |
getBounds(Query query)
Get the spatial bounds of the features that would be returned by
the given
Query. |
int |
getCount(Query query)
Gets the number of the features that would be returned by the given
Query, taking into account any settings for max features and
start index set on the Query. |
DataAccess<SimpleFeatureType,SimpleFeature> |
getDataStore()
Returns the data source, as a
DataAccess object, providing
this FeatureSource. |
SimpleFeatureCollection |
getFeatures()
Retrieves all features in the form of a
FeatureCollection. |
SimpleFeatureCollection |
getFeatures(Filter filter)
Retrieves features, in the form of a
FeatureCollection, based
on an OGC Filter. |
SimpleFeatureCollection |
getFeatures(Query query)
Retrieves features, in the form of a
FeatureCollection, based
on a Query. |
ResourceInfo |
getInfo()
Returns information describing this
FeatureSource which may
include title, description and spatial parameters. |
Name |
getName()
Returns the name of the features (strictly, the name of the
AttributeDescriptor for the features) accessible through this
FeatureSource. |
QueryCapabilities |
getQueryCapabilities()
Enquire what what query capabilities this
FeatureSource
natively supports. |
SimpleFeatureType |
getSchema()
Retrieves the schema (feature type) that will apply to features retrieved
from this
FeatureSource. |
Set<RenderingHints.Key> |
getSupportedHints()
Returns the set of hints that this
FeatureSource supports via Query requests. |
void |
removeFeatureListener(FeatureListener listener)
Removes an object from this
FeatureSource's listeners. |
protected static final Logger LOGGER
protected static final FilterFactory2 FF
protected Transformer transformer
protected SimpleFeatureSource source
public TransformFeatureSource(SimpleFeatureSource source, Name name, List<Definition> definitions) throws IOException
source - name - definitions - IOExceptionpublic Name getName()
FeatureSourceAttributeDescriptor for the features) accessible through this
FeatureSource.
The value returned by this method can be different to that returned by
featureSource.getSchema().getType().getName().
This is because there is a distinction between the name applied to features
and the name of a feature type. When working with SimpleFeature and
SimpleFeatureType, for example with a shapefile data source, it is
common practice for feature and feature type names to be the same. However, this
is not the case more generally. For instance, a database can contain two
tables with the same structure. The feature name will refer to the table
while the feature type name refers to the schema (table structure).
getName in interface FeatureSource<SimpleFeatureType,SimpleFeature>FeatureSourcepublic ResourceInfo getInfo()
FeatureSourceFeatureSource which may
include title, description and spatial parameters. Note that in the
returned ResourceInfo object, the distinction between feature
name and schema (feature type) name applies as discussed for
FeatureSource.getName().getInfo in interface FeatureSource<SimpleFeatureType,SimpleFeature>public DataAccess<SimpleFeatureType,SimpleFeature> getDataStore()
FeatureSourceDataAccess object, providing
this FeatureSource.getDataStore in interface FeatureSource<SimpleFeatureType,SimpleFeature>FeatureSourcepublic QueryCapabilities getQueryCapabilities()
FeatureSourceFeatureSource
natively supports. For example, whether queries can return sorted
results.getQueryCapabilities in interface FeatureSource<SimpleFeatureType,SimpleFeature>FeatureSourcepublic void addFeatureListener(FeatureListener listener)
FeatureSourceFeatureSource.addFeatureListener in interface FeatureSource<SimpleFeatureType,SimpleFeature>listener - the new listenerpublic void removeFeatureListener(FeatureListener listener)
FeatureSourceFeatureSource's listeners.removeFeatureListener in interface FeatureSource<SimpleFeatureType,SimpleFeature>listener - the listener to removepublic SimpleFeatureType getSchema()
FeatureSourceFeatureSource.
For a homogeneous data source such as a shapefile or a database table, this schema be that of all features. For a heterogeneous data source, e.g. a GML document, the schema returned is the lowest common denominator across all features.
getSchema in interface FeatureSource<SimpleFeatureType,SimpleFeature>FeatureSourcepublic ReferencedEnvelope getBounds() throws IOException
FeatureSourcegetBounds(Query.ALL).
It is possible that this method will return null if the calculation
of bounds is judged to be too costly by the implementing class.
In this case, you might call getFeatures().getBounds()
instead.
getBounds in interface FeatureSource<SimpleFeatureType,SimpleFeature>null
if the bounds are unknown or too costly to calculate.IOException - on any errors calculating the boundspublic ReferencedEnvelope getBounds(Query query) throws IOException
FeatureSourceQuery.
It is possible that this method will return null if the calculation
of bounds is judged to be too costly by the implementing class.
In this case, you might call getFeatures(query).getBounds()
instead.
getBounds in interface FeatureSource<SimpleFeatureType,SimpleFeature>query - the query to select featuresnull
if the bounds are unknown or too costly to calculate.IOException - on any errors calculating the boundspublic int getCount(Query query) throws IOException
FeatureSourceQuery, taking into account any settings for max features and
start index set on the Query.
It is possible that this method will return -1 if the calculation
of number of features is judged to be too costly by the implementing class.
In this case, you might call getFeatures(query).size()
instead.
Example use:
int count = featureSource.getCount();
if( count == -1 ){
count = featureSource.getFeatures( "typeName", count ).size();
}getCount in interface FeatureSource<SimpleFeatureType,SimpleFeature>query - the query to select featuresQuery;
or -1 if this cannot be calculated.IOException - if there are errors getting the countpublic Set<RenderingHints.Key> getSupportedHints()
FeatureSourceFeatureSource supports via Query requests.
Note: the existence of a specific hint does not guarantee that it will always be honored by the implementing class.
getSupportedHints in interface FeatureSource<SimpleFeatureType,SimpleFeature>RenderingHints#Key objects; may be empty but never nullHints.FEATURE_DETACHED,
Hints.JTS_GEOMETRY_FACTORY,
Hints.JTS_COORDINATE_SEQUENCE_FACTORY,
Hints.JTS_PRECISION_MODEL,
Hints.JTS_SRID,
Hints.GEOMETRY_DISTANCE,
Hints.FEATURE_2Dpublic SimpleFeatureCollection getFeatures() throws IOException
FeatureSourceFeatureCollection.
The following statements are equivalent:
featureSource.getFeatures();
featureSource.getFeatures(Filter.INCLUDE);
featureSource.getFeatures(Query.ALL);
getFeatures in interface FeatureSource<SimpleFeatureType,SimpleFeature>getFeatures in interface SimpleFeatureSourceQueryIOException - if the underlying data source cannot be accessed.public SimpleFeatureCollection getFeatures(Filter filter) throws IOException
FeatureSourceFeatureCollection, based
on an OGC Filter.getFeatures in interface FeatureSource<SimpleFeatureType,SimpleFeature>getFeatures in interface SimpleFeatureSourcefilter - the filter to select features; must not be null
(use Filter.INCLUDE instead)FilterIOException - if the underlying data source cannot be accessed.Filterpublic SimpleFeatureCollection getFeatures(Query query) throws IOException
FeatureSourceFeatureCollection, based
on a Query.getFeatures in interface FeatureSource<SimpleFeatureType,SimpleFeature>getFeatures in interface SimpleFeatureSourcequery - DataAccess query for requested information, such as typeName,
maxFeatures and filter.QueryIOException - if the underlying data source cannot be accessed.QueryCopyright © 1996–2018 Geotools. All rights reserved.